Method and apparatus for manufacturing a bullet charged with compressible composite explosives

ABSTRACT

The present invention relates to a method and apparatus for manufacturing a bullet charged with compressible composite explosives, process of the method comprising: 1) particle explosives is measured using constant quantity supplying device and is charged to a pallette mold; 2) the particle explosives is transferred to pellet-forming mold and then the particle explosives of the pellet-forming mold is molded under constant pressure to a pellet; 3) the pellet-forming mold is transported to the upper side of the bullet body fixing mold, thereby exiting the pellet of the pellet-forming mold, and the pellet which is inserted to the bullet of the bullet body fixing mold is pressed under constant pressure for charging; 4) the bullet with the pellet completely charged is transported to the bullet separating device; and 5) excess explosives is removed through cutting from said bullet.

TECHNICAL FIELD

The present invention relates to a method and apparatus for charging asmall-scale bullet with compressed high-performance compositeexplosives, and more particularly, to a method and apparatus formanufacturing many bullets charged with compressible compositeexplosives, wherein explosives are measured in constant amount,simultaneously shaped by using a plurality of pallets, and charged tobullets by compression.

BACKGROUND ART

In small or middle caliber bullets, melt-cast explosives are generallyused due to easiness in charging, which includes TNT and Composition B(Comp. B). Also used are particle type explosives like Composition A3(Comp. A3). The conventional explosives, however, are very sensitive toexternal impact and have high chance of explosion while transport,although they are widely used due to the cheap price and easiness formass production.

The method of producing bullets by using the melt-cast explosivescomprises melting the explosives in a container utilizing the propertyof the explosives of melting above 80° C., and pouring certain amount ofthe explosives into the bullet. It is important to cool the explosivesslowly so that cracking or excessive contraction is not generated insidethe explosives. The above-described melt-cast explosives have the meritof mass production of bullets since the explosives are heated and liquidstate explosives are charged to the bullet. However, recently developednew bullets require safety in handling as well as high performance. So,research has been made to increase the stability of the bullet byminimizing the possibility of explosion while carrying and using thebullet, and therefore, much study has been made on the method ofcharging bullets with compressible composite explosives having greaterperformance and lower defects compared to conventional explosives.

The compressible composite explosives is generally produced by coatingexplosives such as HMX(octogen), RDX(hexogen) with polymer materials,and then applying high molding pressure thereby producing solid statepellets. These compressible composite explosives are state of the artexplosives which can have controllable explosive performance andsensitivity by controlling the compositions of the explosives, and areapplied to the warhead of recently developed guided warfare systems.

The compressible composite explosives, however, has had technicallimitation for applying to small caliber bullet due to the difficulty incharging process and manufacturing procedure. In other words, in orderto charge the compressible composite explosives to the bullet, particleexplosives (Molding Powder) in the shape of powder should be moldedunder vacuum at very high molding pressure, considering thecharacteristics of bullet of small and complex internal structure,especially when the bullet is long compared to radius.

Therefore, compressible composite explosives are hardly applied to thesmall bullet. The applicant of the present invention has filed a KoreanPatent Application No. 10-2009-0004285 relating to a precise chargingmethod of compressible composite explosives to the bullet havingfragment notch with long length compared to the radius. The patentapplication, however, relates to a compressible composite explosivescharging method which is appropriate for developing stage but notsufficient for manufacturing the bullets in large quantity, whichrequires additional process and apparatus for applying to amanufacturing method of bullets.

PRIOR ART DOCUMENT Patent Document

Korean Patent Application No. 10-2009-0004285

OBJECT OF THE INVENTION

The present invention has been designed to solve the above mentionedproblem of prior arts and aims to provide a method and apparatus formanufacturing many bullets simultaneously charged with high performancecompressible composite explosives safely and uniformly.

More particularly, the present invention relates to a method andapparatus for manufacturing bullets charged with compressible compositeexplosives, wherein composite explosives are measured in constantamount, simultaneously shaped by using a plurality of pallets, andcharged to bullets by compression.

Also, the present invention aims to provide an automated sequence ofmanufacturing procedure with organically connected and safe methodproviding basis for automated processes for manufacturing bulletscharged with compressible composite explosives.

DISCLOSURE

To accomplish the object of the present invention, the method of thepresent invention for manufacturing bullet charged with compressiblecomposite explosives comprises a first process in which particleexplosives are measured in constant amount by using constant quantitysupplying devices and are charged to pallette molds, a second process inwhich the particle explosives are transferred to a pellet-forming moldsby transporting the pallette mold charged with the particle explosivesto the constant pressure molding device, and returned to the particleexplosives constant quantity supplying device, and then the particleexplosives of the pellet-forming mold is molded under constant pressureto a pellet, a third process in which the pellet-forming mold istransported to the upper side of the bullet body fixing mold which issupplied to the constant pressure charging device thereby exiting thepellet of the pellet-forming mold, and then the pellet-forming mold isreturned to the constant pressure molding device, and the pellet whichis inserted to the bullet in the fixing mold is pressed under constantpressure for charging, a fourth process in which the bullet completelycharged with explosives is transported to the bullet separating devicealong with the bullet body fixing mold, each bullet is separated fromthe bullet body fixing mold to be supplied to the excess explosivescutting device, and then new bullet body fixing mold is supplied to theconstant pressure charging device, and a fifth process in which excessexplosives is removed through cutting from bullet.

According to the method for manufacturing a bullet charged withcompressible composite explosives of the present invention, the fourthprocess is performed after repeating the first process through the thirdprocess three times.

And the pallette mold and the pellet-forming mold and the bullet bodyfixing mold are divided into 64 sections so that 64 bullets are producedper one cycle.

Also, the apparatus for manufacturing a bullet charged with compressiblecomposite explosives, according to the present invention, comprises aparticle explosives constant quantity supplying device which measuresparticle explosives in constant amount and charges a pallette molddivided into a plurality of partitions with the explosives; a constantpressure molding device which inserts particle explosives of thepallette mold to the pellet-forming mold and molds the explosives into apellet by using a plurality of punch operating at the same pressure; aconstant pressure charging device which press-charges the pellet of thepallet-forming mold into a bullet body fixing mold by using a pluralityof punch operating at the same pressure; a bullet supplying device whichsupplies the bullet body fixing mold to the constant pressure chargingdevice; a mold transporting means which repeatedly transports thepallet-forming mold between the constant pressure molding device andconstant pressure charging device, and repeatedly transports the bulletbody fixing mold between the constant pressure charging device and thebullet supplying device; a bullet separating device installed at thebullet supplying device to separate the bullet from the bullet bodyfixing mold; and an excess explosives cutting device which transportsthe bullet separated by the bullet separating device to a conveyer andcuts excess explosives of the bullet.

And, the particle explosives constant quantity supplying devicecomprises a frame provided with a transport guide, a hopper installed atthe upper side of the frame with opening and closing slider equipped atan exit, a constant volume measuring mold which exits through aplurality of holes the particle explosives supplied from the hopper inconstant amount and charges the mold hole of the pallette mold locatedat lower portion thereof, and a pallette mold transporting means whichtransports the pallette mold to the constant pressure molding devicewhen particle explosives is completely charged.

The pallette mold, pellet-forming mold and bullet body fixing mold arerespectively equipped with 64 or more of mold holes having the 8×8structure.

The constant pressure molding device comprises a lower frame housing thepellet-forming mold, a upper frame which is installed in a way to moveup and down along a guide bar installed at 4 corners of the lower frame,and a constant pressure chamber located at the lower part of the upperframe to mold the particle explosives into a pellet by applying constantmolding pressure to a plurality of punches inserted to the mold holes ofthe pellet-forming mold.

Also, the constant pressure molding device further comprises a vacuumbox so that the pellet forming is carried out under vacuum.

The constant pressure chamber comprises a chamber body which includes aplurality of holes for installing a spool which drives the punch and agroove for interconnecting each hole, and a punch holder which is formedin one body with the chamber body and to which the punch is combined.

The constant pressure chamber further comprises a punch guide installedconstant on the lower part of the punch holder to guide the punch.

The constant pressure charging device comprises a lower frame housingthe bullet body fixing mold, a upper frame which is installed in a wayto move up and down along a guide bar installed at 4 corners of thelower frame, and a constant pressure chamber located at the lower partof the upper frame to charge the pellet to the bullet of the bullet bodyfixing mold by applying constant molding pressure to a plurality ofpunches inserted to the mold hole of the pellet-forming mold.

The constant pressure charging device further comprises a vacuum box sothat the pellet molding is carried out under vacuum.

The bullet body fixing mold comprises a lower mold which is equippedwith a plurality of holes to which the bullet is inserted, and a uppermold which is equipped with a plurality of holes into which the punch isinserted and which is combined detachably to the lower mold fixing thebullet which is aligned to the lower mold.

Here, only the lower mold among the bullet body fixing mold can betransported to the bullet supplying device.

The bullet supplying device comprises a transport guide for fixingbullet body fixing mold so that the process of fixing a plurality ofbullet to the bullet body fixing mold, transporting the bullet bodyfixing mold to the constant pressure charging device and separating thebullet transported from the constant pressure charging device frombullet body fixing mold is carried out sequentially, the transport guidebeing constructed so that 3 or more of bullet body fixing molds arearranged and each process is carried out continuously through theorbital shape of the transport guide.

The bullet separating device comprises a finger frame which picks up thebullet of the bullet body fixing mold by using a plurality of fingersthat can pick the bullet and transports to the conveyer of the cuttingdevice of excess explosives, a lifting cylinder installed on a mainframe to lift the finger frame, and a transport means installed on themain frame to transport the finger frame to the direction of the excessexplosives cutting device.

The excess explosives cutting device comprises a cutter for cutting theexplosives charged over the bullet, a supply conveyer for transportingthe bullet supplied from the bullet separating device to the cutter, aexit conveyer for exiting the bullet from which excess explosives isremoved by the cutter, and a bullet holding wheel which picks up eachbullet of the supply conveyer in a way the metal section of the bulletis located perpendicularly to the blade of the cutter and supplies thebullet to the cutter, and supplies the bullet with excess explosivesremoved to the exit conveyer.

The mold transporting means is composed of a first transport means whichtransports the pellet-forming mold and a second transport means whichtransports the bullet body fixing mold, the first transport means beingoperated to transport the pellet-forming mold at a higher positioncompared to the second transport means.

EFFECT OF THE INVENTION

By using the method and apparatus for manufacturing a bullet chargedwith high performance compressible composite explosives of the presentinvention, it is possible to produce bullets in a large scale bycharging the bullet with compressible composite explosives safely anduniformly.

According to the method and apparatus of the present invention, a highperformance stable bullets charged with compressible compositeexplosives are manufactured by measuring the composite explosives inconstant amount, simultaneously molding by using a plurality of pallets,and charging the molded explosives to a bullet by compression, theprocesses being carried out sequentially.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 schematically illustrates the major process of the method formanufacturing a bullet charged with compressible composite explosivesaccording to the present invention.

FIG. 2 schematically illustrates the apparatus for manufacturing abullet charged with compressible composite explosives according to thepresent invention.

FIG. 3 conceptually illustrates the apparatus for manufacturing a bulletcharged with compressible composite explosives according to the presentinvention.

FIG. 4 illustrates the apparatus of the particle explosives constantquantity supplying device.

FIG. 5 conceptually illustrates the important design of particleexplosives constant quantity supplying device.

FIG. 6 is a prospective view of the constant pressure molding device.

FIG. 7 is a cross-sectional view of the matching molding device, theconstant pressure chamber.

FIG. 8 is plane view of the constant pressure chamber of FIG. 7.

FIG. 9 shows another prospective view of the constant pressure chamber.

FIG. 10 is a prospective view of another important part item of thepresent invention, the pellet-forming mold.

FIG. 11 is a prospective view of the present invention, the constantpressure charging device.

FIG. 12 is an explosive prospective view of the important constructionof the present invention, the bullet body fixing mold.

FIG. 13 conceptually shows the bullet supplying device.

FIG. 14 shows the bullet separating device.

FIG. 15 shows the cutting device of the excess explosives.

EMBODIMENT OF THE INVENTION

The method for manufacturing a bullet charged with compressiblecomposite explosives according to the present invention will bedescribed in more detail with reference to the drawings attached.

The method for manufacturing a bullet charged with compressiblecomposite explosives according to the present invention, as shown inFIG. 1, comprises: a first process in which particle explosives ismeasured in constant amount by using a particle explosives constantquantity supplying device 10 and is charged to a pallette mold 15, asecond process in which the particle explosives is transferred to apellet-forming mold 25 by transporting the pallette mold 15 charged withthe particle explosives to the constant pressure molding device 20, andreturned to the particle explosives constant quantity supplying device10, and then the particle explosives of the pellet-forming mold 25 ismolded under constant pressure to a pellet, a third process in which thepellet-forming mold 25 is transported to the upper side of the bulletbody fixing mold 35 which is supplied to the constant pressure chargingdevice 30, thereby exiting the pellet 25′ of the pellet-forming mold 25,and then the pellet-forming mold 25 is returned to the constant pressuremolding device 20, and the pellet 25′ which is inserted to the bullet 45of the bullet body fixing mold 35 is pressed under constant pressure forcharging, a fourth process in which the bullet 45 with the pellet 25′completely charged is transported to the bullet separating device 50along with the bullet body fixing mold 35, each bullet 45 is separatedfrom the bullet body fixing mold 35 to be supplied to the excessexplosives cutting device 70, and then new bullet body fixing mold 35 issupplied to the constant pressure charging device 30, and a fifthprocess in which excess explosives is removed through cutting from saidbullet 45.

At this step, it is preferable to perform the fourth process afterrepeating the first process through the third process three times sinceit is impossible to fully charge the bullet 45 by using only one pellet25′. Also, each of the pallette mold 15, pellet-forming mold 25 andbullet body fixing mold 35 is preferably divided into 64 partitions, onecycle producing 64 bullets 45.

The method for manufacturing a bullet charged with compressiblecomposite explosives as described above is carried out as follows.

In the first process, particle explosives is measured in constant amountby using a particle explosives constant quantity supplying device 10,then charged to a pallette mold 15, and then the pallette mold 15 istransferred to a constant pressure molding device 12.

And, in the second process, the particle explosives supplied through thepallette mold 15 from the constant pressure molding device 12 is moldedinto pellet 25′ under constant pressure, in which 64 pellets 25′ aresimultaneously molded in one molding process. During the second process,the pallette mold 15 is transported to the particle explosives constantquantity supplying device 10, carrying out the first processindependently. In other words, the particle explosives are measured inconstant amount in order to supply the particle explosives to the secondprocess.

In the third process, the pellet 25′ molded at the constant pressuremolding device 20 is transported to the constant pressure chargingdevice 30 along with pellet-forming mold 25 for charging to the bullet45, and then the pellet 25′ of the pellet-forming mold 25 is charged tothe bullet 45 of the bullet body fixing mold 35 under constant pressure.In the third process, the pellet 25′ is exited to the bullet body fixingmold 35, and then the exited pellet-forming mold 25 is returned to theconstant pressure molding device 20, repeating the process of the secondprocess, and the constant pressure charging device 30 presses andcharges the pellet 25′ at the 64 bullets 45 simultaneously. At thisstep, three pellets 25′ at the bullet 45 are changed repeating the firstthrough the third process three times, thereby completing constantpressure charging of the pellet 25′ at the 64 bullets 45.

In the fourth process, the completely charged bullet 45 at the pellet25′ is transported along with the bullet body fixing mold 35 to thebullet separating device 50, and after the bullet body fixing mold 35 istransported to the bullet separating device 50, another bullet 45 at thefixed new bullet body fixing mold 35 is transported to the constantpressure charging device 30 waiting for being processed by the thirdprocess.

Finally, in the fifth process, the excess explosives of the bullet 45 isremoved, thereby after excess explosives is completely cut, 64 bullets45 with high performance compressible composite explosives charged areobtained.

In summary, starting from particle explosives, the process, in whichbullet is charged with explosives and excess explosives is removed, iscarried out in one cycle, each process being operated organically whileindependently, thereby greatly increasing the manufacturing capacitythrough automation.

Meanwhile, the apparatus of the present invention for manufacturing abullet charged with compressible composite explosives, as illustrated inFIGS. 2 and 3, comprises, a particle explosives constant quantitysupplying device 10 which measures particle explosives in constantamount and charges a pallette mold 15 divided into a plurality ofpartitions with the explosives; a constant pressure molding device 20which inserts the particle explosives of the pallette mold 15 to thepellet-forming mold 25 and mold the explosives into a pellet 25′ byusing a plurality of punch 26 operating at the same pressure; a constantpressure charging device 30 which press-charges the pellet 25′ of thepellet-forming mold 25 into the bullets (45) a bullet body fixing mold35, by using a plurality of punch 36 operating at the same pressure; abullet supplying device 40 which supplies the bullet body fixing mold 35to the constant pressure charging device 30; a mold transporting means70 which repeatedly transports the pellet-forming mold 25 between theconstant pressure molding device 20 and constant pressure chargingdevice 30, and repeatedly transports the bullet body fixing mold 35between the constant pressure charging device 30 and the bulletsupplying device 40; a bullet separating device 50 installed at thebullet supplying device 40 to separate the bullet 45 from the bulletbody fixing mold 35; and an excess explosives cutting device 60 whichtransports the bullet 45 separated by the bullet separating device 50 toa conveyer and cuts excess explosives of the bullet

The particle explosives constant quantity supplying device 10 comprisesa frame 11 provided with a transport guide, a hopper 12 installed at theupper side of the frame 11 with opening and closing slider equipped atan exit, a constant volume measuring mold 13 which exits through aplurality of holes the particle explosives supplied from the hopper 12in constant amount and charges the mold hole of the pallette moldlocated at lower portion thereof, a pallette mold transporting means 14which transports the pallette mold to the constant pressure moldingdevice 20 when particle explosives is completely charged, a main hopper16 storing the particle explosives, and a conveyor 17 which supplies theparticle explosives of the main hopper 16 to the hopper 12.

Here, the constant volume measuring mold 13 charges the pallette mold 15with particle explosives per row, and the pallette mold transportingmeans 14 transports the pallette mold 15 with constant pitch untilparticle explosives is charged in all the mold hole of the pallette mold15. In other words, the constant volume measuring mold 13 has 8 holesformed therein and the pallette mold 15 has 64 mold holes with 8×8structure, thereby the constant volume measuring mold 13 charges at arate of 8 rows per each cycle and the pallette mold transporting means14 transports the pallette mold 15 in the unit of 1 row of the moldhole.

And, the constant pressure molding device 20 comprises a lower frame 21housing the pellet-forming mold 25, a upper frame 23 which is installedin a way to move up and down along a guide bar 22 installed at 4 cornersof the lower frame 21, a constant pressure chamber 24 located at thelower part of the upper frame 23 to mold the particle explosives into apellet 25′ by applying constant molding pressure to a plurality ofpunches 25′ inserted to the mold hole of the pellet-forming mold 25, anda vacuum box 27 which separates the inner side where the pellet-formingmold 25 locates from the outer side so that pellet molding is carriedout under vacuum.

Here, a hydraulic device 28 for operating the constant pressure chamber24 and a vacuum exiting means (not shown) for introducing vacuum to thevacuum box 27 are installed on the upper frame 23.

Meanwhile, the constant pressure chamber 24 comprises a chamber body 24a which includes a plurality of holes for installing a spool 24 b whichdrives the punch 26 and a groove 24 c for interconnecting each hole, apunch holder 24 d which is formed in one body with the chamber body 24 aand to which the punch 26 is combined, and a punch guide 24 e installedon the lower part of the punch holder 24 d to guide the punch 26. Thepunch 26 is preferably installed in a way not constant to the punchholder 24 d so that the punch can move up and down. Also, thepellet-forming mold 25 is processed at the inlet of the mold hole withchamfering 25″.

Also, the pellet-forming mold 25 and bullet body fixing mold 35 have 64mold holes with 8×8 structure, as well as the constant pressure chamber24 which has 64 punches 26 with 8×8 structure, thereby making itpossible to mold 64 pellets 25′ simultaneously.

The constant pressure charging device 30 comprises a lower frame 31housing the bullet body fixing mold 35, a upper frame 33 which isinstalled in a way to move up and down along a guide bar 32 installed at4 corners of the lower frame 31, a constant pressure chamber 34 locatedat the lower part of the upper frame 33 to charge the pellet 25′ to thebullet 45 of the bullet body fixing mold 35 by applying constant moldingpressure to a plurality of punches 36 inserted to the mold hole of thepallette mold 25, and a vacuum box 37 which separates inner side wherethe pallette mold 25 resides from outré side so that the pellet moldingis carried out under vacuum.

Here, the constant pressure charging device 30 is also installed at theupper frame 31, and is equipped with a hydraulic device 38 for drivingthe constant pressure chamber 34 and a vacuum exiting system (not shown)for introducing vacuum to the vacuum box 37. The construction of theconstant pressure chamber 34 is the same as that of the constantpressure chamber 24 of the constant pressure molding device 20 exceptfor some functional aspects and so the explanation is omitted.

Meanwhile, the bullet body fixing mold 35 comprises a lower mold 35 awhich is equipped with a plurality of holes to which the bullet 45 isconstant, and a upper mold 35 b which is equipped with a plurality ofholes into which the punch 36 is inserted and which is combineddetachably to the lower mold 35 a fixing the bullet 45 which is constantto the lower mold 35 a. The hole of the lower mold 35 a is preferablyprocessed larger than the external radius of the bullet, and the hole ofthe upper mold 35 b is preferably processed larger than the externalradius of the punch 36. And only the lower mold 35 a among the bulletbody fixing mold 35 is transported to the bullet supplying device 40 andthe upper mold 35 remains with no transport.

Herein, more than necessary amount of pellet 25′ is charged to thebullet 45 at the constant pressure charging device 30, which is inconsideration of the processing error in manufacturing the bullet andthe error in molding the pellet 25′. In other words, the bullet 45 ischarged with excessive amount of pellet 25′, and then the unnecessaryexcess explosives is cut out, thereby making the amount of the pellet25′ charged to the bullet 45 in optimum amount.

And, the bullet supplying device 40 comprises a transport guide 41 forfixing bullet body fixing mold 35 so that the process of fixing aplurality of bullet 45 to the bullet body fixing mold 35, transportingthe bullet body fixing mold 35 to the constant pressure charging device30 and separating the bullet transported from the constant pressurecharging device 30 from the bullet body fixing mold 35 is carried outsequentially, the transport guide 41 being constructed so that 3 or moreof bullet body fixing molds 35 are arranged and each process is carriedout continuously through the orbital shape of the transport guide 41.

Also, the bullet separating device 50 comprises a finger frame 53 whichpicks up the bullet 45 of the bullet body fixing mold 35 by using aplurality of fingers 52 that can pick the bullet 45 and transports tothe conveyer of the cutting device 60 of excess explosives, a liftingcylinder 54 installed on a main frame 51 to lift the finger frame 53,and a transport means 55 installed on the main frame 51 to transport thefinger frame 53 to the direction of the excess explosives cutting device60.

And the excess explosives cutting device 60 comprises a cutter 65 forcutting the explosives charged over the bullet 45, a supply conveyer 61for transporting the bullet 45 supplied from the bullet separatingdevice 50 to the cutter 65, a exit conveyer 62 for exiting the bullet 45from which excess explosives is removed by the cutter 65, and a bulletholding wheel 63 which picks up each bullet 45 of the supply conveyer 61in a way the metal section of the bullet 45 is located perpendicularlyto the blade of the cutter 65 and supplies the bullet 45 to the cutter65, and supplies the bullet 45 with excess explosives removed to theexit conveyer 62.

Meanwhile the mold transporting means 70 is composed of a firsttransport means 71 which transports the pellet-forming mold 25 and asecond transport means 72 which transports the bullet body fixing mold35, the first transport means 71 being operated to transport thepellet-forming mold 25 at a higher position compared to the secondtransport means 72, the first transport means 71 being operated to movethe pellet-forming mold 25 at higher location compared to the secondtransport means 72.

By using the apparatus for manufacturing a bullet charged withcompressible composite explosives as described above, particleexplosives is molded into a pellet and the process of charging into thebullet is carried out sequentially.

The particle explosives constant quantity supplying device 10 has therole of supplying particle explosives in constant amount to mold pellet25′ of uniform standard, and can supply particle explosives to thepallette mold 15 in constant amount by calculating the volume. In otherwords, in order to mold the pellet 25′, necessary amount of the particleexplosives is calculated in volume, and then particle explosives in theamount corresponding to the volume is filled into the pallette mold 15.

The particle explosives which is supplied from the main hopper 16 wherethe particle explosives is contained in the hopper 12 before beingsupplied to the constant volume measuring mold 13, and the 8 holesinstalled on the constant volume measuring mold 13 is filled withparticle explosives as the open-closed slider on the lower portion ofthe hopper 12 is opened. At this stage, when the constant volumemeasuring mold 13 is fully filled with particle explosives, theopen-closed slider is closed so that the constant volume measuring mold13 is filled with precise amount of volume of particle explosives.

Thereafter, the pallette mold 15 moves by one pitch by the pallette moldtransporting means 14, the particle explosives in the constant volumemeasuring mold 13 is supplied to the pallette mold 15 as soon as thehole of the constant volume measuring mold 13 and the mold hole of thepallette mold 15 coincides. At this stage, due to the 64 mold holesinstalled on the pallet mold 15, the constant volume measuring mold 13which includes 8 holes supplies particle explosives to the pallette mold8 times sequentially.

Thereafter, the pallette mold 15 is moved to the constant pressuremolding device 20 by the pallette mold transporting means 14 andsupplies particle explosives to the pellet-forming mold 25 installed onthe constant pressure molding device 20, and the pallette mold 15 withempty mold hole is returned to the particle explosives constant quantitysupplying device 10 and repeatedly carries out the above processes,thereby repeatedly supplying particle explosives to the pellet-formingmold 25 of the constant pressure molding device 20.

Here, the weight of the particle explosives is measured by the particleexplosives constant quantity supplying device 10, which showed margin of±0.1 g at constant quantity of 3.5 g. The margin of ±0.1 g is consideredto be generated from the difference of the size of particle explosives.

When particle explosives is supplied to the pellet-forming mold 25, theconstant pressure molding device 20 starts to operate the process themolding of the pellet. The constant pressure molding device 20 isdesigned considering mass productivity and stability, in which theconcept of molding under constant pressure is introduced to secure firstspatial stability and then secure moldability of the gunpowder. Hence,the concept of molding under constant pressure make it possible tosecure stability and moldability when a plurality of punches 26 are usedto simultaneously mold a plurality of pellets 25′. In the process, theconstant pressure chamber 24 is placed between the hydraulic device 28and the punch 26 so that the pressure generated from the hydraulicdevice 28 is uniformly distributed and transferred to each punch 26 bythe constant pressure chamber 24.

Since the constant pressure chamber 24 is filled with grease and oil, asthe pressure generated by the contact of the punch 26 installed at theparticle explosives and the constant pressure chamber 24 is transferredto the constant pressure chamber 24, the grease and oil moves along thegroove 24 c connected to each punch 26 and spool 24 b, therebymaintaining the pressure in the constant pressure chamber 24 uniformlyand finally making the same pressure applied to each punch 26.

This concept of molding under constant pressure is based on the theoryof Pascal which means that all forces applied at any one random pointinside the fluid is the same, which allows in the present invention thatuniform mold density is obtained due to the same pressure applied to the64 punches. Also, excessive local power applied to some punches 26 isbasically prevented, thereby securing the safety of the process. Byutilizing the concept of molding under constant pressure, there is alsothe merit of obtaining relatively uniform mold density since samepressure is transferred despite the variance of the height of the moldedbody due to the difference in the weight of the particle explosivesduring molding.

The constant pressure molding device 24 includes 64 punches 26, eachpunch 26 being installed not fixed in order to be able to move withconstant interval, so they are arranged naturally as the punch 26 isinserted inside the pellet-forming mold 25 during the pellet molding andenables molding the particle explosives into pellet 25′. On thepellet-forming mold 25 is installed 64 mold holes, and the particleexplosives supplied to each mold hole is molded into pellet 25′ by thepunch 26.

The order of process in the constant pressure molding device 20 is asfollows.

When particle explosives is supplied from the particle explosivesconstant quantity supplying device 10 to the pellet-forming mold 25, thevacuum box 27 of the constant pressure molding device 20 moves downward,thereby setting the region near the pellet-forming mold 25 at vacuum. Asthe vacuum box 27 moves down 64 punches 26 also moves down and stopsright above the pellet-forming mold 25. Thereafter, when inside of thevacuum box 27 reaches a near vacuum of 20 mmHg (the complete vacuumcorresponds to 0 mmHg in this specification) the punch 26 is insertedinto the mold hole of the pellet-forming mold 25, thereby contacting theparticle explosives with the punch 26.

At this state, when the punch 26 moves down by the hydraulic device 28,pressure is generated between the particle explosives and the punch 26,and then the pressure generated is transferred to the spool 24 b in theconstant pressure chamber 24, thereby compressing the operational oilbody including a mixture of grease and oil and maintaining constantpressure in the constant pressure chamber 24. If the pressure inside theconstant pressure chamber 24 is maintained at a constant pressure, themolding pressure of the punch 26 is also maintained at the constantpressure, and the particle explosives is molded into a 25′ whilemaintaining the constant pressure state for 30 seconds or more.

The pressure applied by the punch 26 to mold the pellet 25′ is 1757kg/cm²(25000 psi), and is maintained for 30 seconds or more, then thepunch 26 is separated from the pellet-forming mold 25, thereby exitingfrom the vacuum state with the vacuum box 27 being lifted. With this onecycle of molding process, 64 pellets 25′ are molded.

The table 1 shows the density distribution of 64 molded pellets. Asshown in the table, when theoretical maximum density of the particleexplosives is 1.763 g/cc, the density distribution of the pellets moldedunder constant pressure is in the range of 1.750 g/cc-1.761 g/cc, whichcorresponds to 99.26%-99.88% of the theoretical maximum density. Thepellet density shows high density with uniform distribution.

TABLE 1 No. density(g/cc) 1 1.753 2 1.755 3 1.753 4 1.751 5 1.756 61.750 7 1.757 8 1.750 9 1.759 10 1.752 11 1.758 12 1.758 13 1.757 141.755 15 1.756 16 1.760 17 1.755 18 1.759 19 1.760 20 1.762 21 1.760 221.759 22 1.759 23 1.753 24 1.752 25 1.755 26 1.761 27 1.758 28 1.750 291.760 30 1.757 31 1.758 32 1.755 33 1.756 34 1.753 35 1.750 36 1.753 371.756 38 1.758 39 1.758 40 1.759 41 1.757 42 1.755 43 1.756 44 1.759 451.757 46 1.760 47 1.759 48 1.759 49 1.757 50 1.754 51 1.761 52 1.761 531.761 54 1.755 55 1.752 56 1.757 57 1.759 58 1.750 59 1.755 60 1.750 611.751 62 1.754 63 1.750 64 1.755

Meanwhile, at the constant pressure chamber 24 is equipped a punch guide24 e so that the punch 26 is uniformly inserted into the inside of thepellet-forming mold 25. Here, the inlet of the pellet-forming mold 25 isprocessed with chamfering 25″ so that metallic friction is minimizedwhen the punch 26 is inserted.

Meanwhile, the pellet 25′ which is completely molded in thepellet-forming mold 25 remains inside the pellet-forming mold 25 withoutbeing separated. This is for the pellet 25′ to be press-charged to thebullet 45 more efficiently. In other words, since the pellet 25′ isinserted into the bullet 45 by moving the pellet-forming mold 25 abovethe bullet body fixing mold 35 in which the bullet 45 is installed whilethe pellet 25′ is present, there is no need for another device forseparating the pellet 25′ from the pellet-forming mold 25 and theninserting again into the bullet 450. Also, the method of supplyingpellet 25′ to the bullet 45 by using the pellet-forming mold 25 is veryefficient in automation and provides the effect of productivity inmanufacturing.

The pellet 25′ which is completely molded is charged to the bullet 45 byusing the method disclosed in the Korean patent application no.10-2009-004285, which includes the step of press-charging 3 pellets 25′to the inside of the bullet 45 sequentially. In using this method, theconcept of molding under constant pressure which is introduced tosequentially charge 64 bullets 45 with pellet 25′ is applied in chargingthe bullet 45. In other words, 64 pellets 25′ molded at the constantpressure molding device 20 are simultaneously supplied to the bullet 45and the concept of press-charging under constant pressure is applied byusing the 64 punches 36 installed on the constant pressure chargingdevice 30. By repeating the process three times, the bullet is chargedwith pellet more quickly, thereby securing security and productivity ofcharging the bullet.

The constant pressure charging device 30 for this process has similarconstruction to the construction of the constant pressure molding device20 except that the punch 36 used and the bullet body fixing mold 35fixing the bullet have different structures. When pellet 25′ iscompletely molded, the pellet-forming mold 25 is transported to theconstant pressure charging device 30. At this stage, the constantpressure charging device 30, the bullet 45 is in wait state fixed to thebullet body fixing mold 35 which fixes the bullet 45. As transportedpellet-forming mold 25 moves to the upper portion of the bullet bodyfixing mold 35, the punch 36 of the constant pressure charging device 30slowly moves down pushing in the pellet 25′ at the pellet-forming mold25 into the bullet 45. When the pellet 25′ is inserted into the bullet45, the pellet-forming mold 25 is returned to the constant pressuremolding device 20, and the upper mold 35 b of the bullet body fixingmold 35 is assembled to the lower mold 35 a.

When the bullet 45 is completely fixed to the upper and lower mold 35 a,35 b of the bullet body fixing mold 35, the vacuum box 37 moves down tothe bullet body fixing mold 35 and vacuum state under 20 mmHg isgenerated. When vacuum state is reached, the punch 36 of the constantpressure charging device 30 moves down and contacts the pellet 25′,thereby generating pressure to each punch 36 which is transferred to theconstant pressure chamber 34.

The pressure is transferred to the operational fluid composed of greaseand oil inside the constant pressure chamber 34, and the inside of theconstant pressure chamber 34 is set to the same pressure and the samepressure is applied to the punch 36, and then the punch 36 press-chargesthe pellet 25′ inside the bullet 45 under constant pressure. Thepressure by which the pellet 25′ is press-charged to the bullet 45 isthe same as the pressure of molding the pellet 25′, which is 1757kg/cm²(25000 psi). In this way, 64 pellets 25′ are simultaneouslycharged to the 64 bullets 45 per one cycle, and by repeating thisprocess three times, the process of press-charging pellet 25′ to 64bullets 45 is completed.

When the bullet 25 is completely charged with pellet 25′, among thebullet body fixing mold 35, the upper mold 35 b is separated from thelower mold 35 a, and the lower mold 35 a is transported to the bulletsupplying device 40 by the second transport means 72 with the bullet 45fixed.

The bullet body fixing mold 35 which is supplied to the bullet supplyingdevice 40 is transported to the bullet separating device 50 along thetransport guide 41 in the shape of orbit, and new bullet body fixingmold 35 is supplied to the constant pressure charging device 30 by thesecond transport means 72 and stays in wait state for charging. Then,the bullet 45 inside of which is empty is manually fixed to other bulletbody fixing mold 35.

The bullet separating device 50 efficiently separates the bullet 45 fromthe bullet body fixing mold 35 by using the finger 52 that can pick upthe bullet 45. In other words, the finger frame 53 moves down by thelifting cylinder 53 and the finger 52 can pick up the bullet 45 of thebullet body fixing mold 35, and then the finger frame 53 moves up andsupplies the bullet 45 to the excess explosives cutting device 60 bymoving horizontally or rotating by the transport means 55.

The excess explosives cutting device 60 has the role of cutting theportion of explosives which is charged over the bullet 45 when thepellet 25′ is charged to the bullet 45. The reason that the pellet 25′is charged over the bullet 45 is that the height of the bullet 45 variesdue to the process error of the bullet body and that the size of themolded pellet 25′ also varies slightly. For this reason, the pellet 25′is molded slightly bigger than actually necessary in charging andcharged to the bullet 45, and so explosives is generally charged overthe bullet 45.

The excess explosives cutting device 60 cuts the excess explosives byusing the cutter 65 as the bullet 45 separated by the bullet separatingdevice 50 moves sequentially one by one along the supply conveyer 61.More specifically, when the bullet 45 transported by the supply conveyer61 is picked up by the bullet holding wheel 63 and placed inperpendicular with the cutter 65, the cutter 65 cuts excess explosivesof the bullet 45. At this time, the cutter 65 contacts metal section ofthe bullet 45 in order to set reference plane and moves perpendicularlywith reference to the cross section of the bullet 45 and cuts the excessexplosives over the bullet. In this way, excess explosives of the bullet45 is removed by the excess explosives cutting device 60, whichcompletes the process of charging compressible composite explosives tothe bullet 45.

Preferable embodiments of the present invention have been described inthe specification. The examples, however, are not intended to limit thepresent invention to specific embodiments and any one who is skilled inthe art may be able to modify the invention appropriately within thescope of the invention as described in claims.

1. A method for manufacturing a bullet charged with compressiblecomposite explosives, which comprises: a first process in which particleexplosives is measured in constant amount by using a particle explosivesconstant quantity supplying device and is charged to a pallette mold, asecond process in which the particle explosives is transferred to apellet-forming mold by transporting the pallette mold charged with theparticle explosives to the constant pressure molding device, andreturned to the particle explosives constant quantity supplying device,and then the particle explosives of the pellet-forming mold is moldedunder constant pressure to a pellet, a third process in which thepellet-forming mold is transported to the upper side of the bullet bodyfixing mold which is supplied to the constant pressure charging device,thereby exiting pellet of the pellet-forming mold, and then thepellet-forming mold is returned to the constant pressure molding device,and the pellet which is inserted to the bullet of the bullet body fixingmold is pressed under constant pressure for charging, a fourth processin which the bullet with the pellet which is completely charged istransported to the bullet separating device along with the bullet bodyfixing mold, each bullet is separated from the bullet body fixing moldto be supplied to the excess explosives cutting device, and then newbullet body fixing mold is supplied to the constant pressure chargingdevice, and a fifth process in which excess explosives is removedthrough cutting from said bullet.
 2. The method for manufacturing abullet charged with compressible composite explosives according to claim1, wherein the fourth process is performed after repeating the firstprocess through the third process three times.
 3. The method formanufacturing a bullet charged with compressible composite explosivesaccording to claim 1 or 2, wherein the pallette mold and pellet-formingmold and the bullet body fixing mold are divided into 64 sections sothat 64 bullets are produced per one cycle.
 4. Apparatus formanufacturing a bullet charged with compressible composite explosives,which comprises: a particle explosives constant quantity supplyingdevice which measures particle explosives in constant amount and chargesa pallette mold divided into a plurality of partitions with theexplosives, a constant pressure molding device which inserts particleexplosives of the pallette mold to the pellet-forming mold and molds theexplosives into a pellet by using a plurality of punch operating at thesame pressure, a constant pressure charging device which press-chargesthe pellet of the pellet-forming mold into a bullet body fixing mold byusing a plurality of punch operating at the same pressure, a bulletsupplying device which supplies the bullet body fixing mold to theconstant pressure charging device, a mold transporting means whichrepeatedly transports the pallette mold between the constant pressuremolding device and constant pressure charging device, and repeatedlytransports the bullet body fixing mold between the constant pressurecharging device and the bullet supplying device, a bullet separatingdevice installed at the bullet supplying device to separate the bulletfrom the bullet body fixing mold, and an excess explosives cuttingdevice which transports the bullet separated by the bullet separatingdevice to a conveyer and cuts excess explosives of the bullet.
 5. Theapparatus for manufacturing a bullet charged with compressible compositeexplosives according to claim 4, wherein the particle explosivesconstant quantity supplying device comprises a frame provided with atransport guide, a hopper installed at the upper side of the frame withopening and closing slider equipped at an exit, a constant volumemeasuring mold which exits through a plurality of holes the particleexplosives supplied from the hopper in constant amount and charges themold hole of the pallette mold located at lower portion thereof, and apallette mold transporting means which transports the pallette mold tothe constant pressure molding device when particle explosives iscompletely charged.
 6. The apparatus for manufacturing a bullet chargedwith compressible composite explosives according to claim 4, wherein thepallette mold, pellet-forming mold and the bullet body fixing mold arerespectively equipped with 64 or more of mold hole having the 8×8structure.
 7. The apparatus for manufacturing a bullet charged withcompressible composite explosives according to claim 4, wherein theconstant pressure molding device comprises a lower frame housing thepellet-forming mold, a upper frame which is installed in a way to moveup and down along a guide bar installed at 4 corners of the lower frame,and a constant pressure chamber located at the lower part of the upperframe to mold the particle explosives into a pellet by applying constantmolding pressure to a plurality of punches inserted to the mold hole ofthe pellet-forming mold.
 8. The apparatus for manufacturing a bulletcharged with compressible composite explosives according to claim 7,wherein a vacuum box which separates the inner side where thepellet-forming mold locates from the outer side is equipped so that thepellet molding is carried out under vacuum.
 9. The apparatus formanufacturing a bullet charged with compressible composite explosivesaccording to claim 7, wherein the constant pressure chamber comprises achamber body which includes a plurality of holes for installing a spoolwhich drives the punch and a groove for interconnecting each hole, and apunch holder which is formed in one body with the chamber body and towhich the punch is combined.
 10. The apparatus for manufacturing abullet charged with compressible composite explosives according to claim9, wherein the constant pressure chamber further comprises a punch guidefixed the lower part of the punch holder to guide the punch.
 11. Theapparatus for manufacturing a bullet charged with compressible compositeexplosives according to claim 4, wherein the constant pressure chargingdevice comprises a lower frame housing the bullet body fixing mold, aupper frame which is installed in a way to move up and down along aguide bar installed at 4 corners of the lower frame, and a constantpressure chamber located an the lower part of the upper frame to chargethe pellet to the bullet of the bullet body fixing mold by applyingconstant molding pressure to a plurality of punches inserted to the moldhole of the pellet-forming mold.
 12. The apparatus for manufacturing abullet charged with compressible composite explosives according to claim11, wherein the constant pressure charging device further comprises avacuum box so that the pellet molding is carried out under vacuum. 13.The apparatus for manufacturing a bullet charged with compressiblecomposite explosives according to claim 4 or 11, wherein the bullet bodyfixing mold comprises a lower mold which is equipped with a plurality ofholes to which the bullet is constant, and a upper mold which isequipped with a plurality of holes into which the punch is inserted andwhich is combined detachably to the lower mold fixing the bullet whichis fixed to the lower mold.
 14. The apparatus for manufacturing a bulletcharged with compressible composite explosives according to claim 13,wherein only the lower mold among the bullet body fixing mold istransported to the bullet supplying device.
 15. The apparatus formanufacturing a bullet charged with compressible composite explosivesaccording to claim 4, wherein the bullet supplying device comprises atransport guide for fixing bullet body fixing mold so that the processof fixing a plurality of bullet to the bullet body fixing mold,transporting the bullet body fixing mold to the constant pressurecharging device and separating the bullet transported from the constantpressure charging device from the bullet body fixing mold is carried outsequentially, the transport guide being constructed so that 3 or more ofbullet body fixing molds are arranged and each process is carried outcontinuously through the orbital shape of the transport guide.
 16. Theapparatus for manufacturing a bullet charged with compressible compositeexplosives according to claim 4, wherein the bullet separating devicecomprises a finger frame which picks up the bullet of the bullet bodyfixing mold by using a plurality of fingers that can pick the bullet andtransports to the conveyer of the cutting device of excess explosives, alifting cylinder installed on a main frame to lift the finger frame, anda transport means installed on the main frame to transport the fingerframe to the direction of the excess explosives cutting device.
 17. Theapparatus for manufacturing a bullet charged with compressible compositeexplosives according to claim 4, wherein the excess explosives cuttingdevice comprises a cutter for cutting the explosives charged over thebullet, a supply conveyer for transporting the bullet supplied from thebullet separating device to the cutter, a exit conveyer for exiting thebullet from which excess explosives is removed by the cutter, and abullet holding wheel which picks up each bullet of the supply conveyerin a way the metal cross section of the bullet is locatedperpendicularly to the blade of the cutter and supplies the bullet tothe cutter, and supplies the bullet with excess explosives removed tothe exit conveyer.
 18. The apparatus for manufacturing a bullet chargedwith compressible composite explosives according to claim 4, wherein themold transporting means is composed of a first transport means whichtransports the pellet-forming mold and a second transport means whichtransports the bullet body fixing mold, the first transport means beingoperated to transport the pellet-forming mold at a higher positioncompared to the second transport means.